/Engine/Source/Developer/SourceControl/Public/SourceControlHelpers.h
Blocks until action is complete.
Source control state - see USourceControlState. It will have bIsValid set to false if it could not have its values set.
static [FSourceControlState](API\Developer\SourceControl\FSourceControlState) QueryFileState ( const [FString](API\Runtime\Core\Containers\FString) & InFile, bool bSilent )